Twisting device for pneumatic spinning



y2 .1970 L. 1. QSKIN ETAL 3,521,440

TWISTING DEVICE FOR PNEUMATIC SPINNING Filed March 6, 1968 2 Sheets-Sheet 1 FIG.I

y 1970 L1. OSKIN ETAL 3,521,440

TWISTING DEVICE FOR PNEUMATIC SPINNING Filed March 6, 1968 I 2 Sheds-Sheet 2 FIG. 2

United States. Patent 3,521,440 TWISTING DEVICE FOR PNEUMATIC SPINNING Lev Ivanovich Oskin, Odesskaya ulitsa 14, korpus 4, kv. 20; Chary Anna-Seidov, Ulitsa Televidenia 22, korpus 1, kv. 58; Alexandr Sergeevich Zhukov, Nagornaya ulitsa 32, korpus 3, kv. 71; and Alexandr Fedoseevich Zadoya, Ulitsa Gashepa 11, kv. 54, all of Moscow, U.S.S.R.

Filed Mar. 6, 1968, Ser. No. 711,000 Int. Cl. D01h 1/12, 7/74, 13/16 US. Cl. 5758.89 Claims ABSTRACT OF THE DISCLOSURE A twisting device for pneumatic spinning comprises an ofltake channel for withdrawing fibers in the event of a breakage of the spun thread, the ofitake channel being in communication with a channel for the introduction of the fibers and with an air main which in turn also communicates with a fiber spinning chamber through an air exhaust duct, a valve device being arranged at the point where the ofitake channel and the air exhaust duct communicate with the air main for alternately closing communication between the air main and the otftake channel and the air exhaust duct.

The present invention relates to machines for ringless spinning and, more particularly, to twisting devices for pneumatic spinning.

There are known twisters for pneumatic spinning comprising a rotary filament-forming cup mounted in a housing provided with an air suction duct and with a cover wherein at least one fiber inlet channel and one yarn outlet channel are positioned, and a sensing unit serving to control the yarn tension is provided at the outlet of the device.

The known twisters are not provided with a fiber catcher for removing the fibers from the device in case of filament breakage. In such devices, the fiber after breakage of yarn continues to come out from the drafter to the filament-forming cup and clogs the latter. If the drafter is not disengaged, the continuous delivery of fiber may cause damage to the twisting device or to the drafter. Therefore, the operation of the known twisters should be at all times controlled by an operator, which complicates the servicing.

An object of the present invention is to develop such a twisting device for pneumatic spinning which, when the yarn is broken, will automatically feed the fibers, coming to the filament-forming cup, to an air main.

According to the aforesaid and other objects of the invention, in the twisting device thereof for pneumatic spinning the channel for inlet or fiber into the filamentforming cup has an oiftake channel for removal of fiber in the case of yarn breakage, said otftake channel adjoining the air exhaust duct, a gating arrangement alternately closing said channels being provided at the juncture of the ofi'take channel with the air exhaust d-uct.

It is advisable to construct the gating arrangement as a flap gate connected with an actuating mechanism, in particular with an electromagnet, controlled from a yarn tension sensing unit and closing the air exhaust duct in the case of yarn breakage, or the otftake channel in the case of normal operation of the spinning process. The gating arrangement in this case may have an outlet to the juncture of the housing with the cover. It is advantageous to have the number of the oiftake channels correspond to the number of fiber inlet channels.

The employment of the present twisting device for machines with separate processes of spinning and winding 3,521,440 Patented July 21, 1970 ice provides for an increase of labor efiiciency and for automatic removal to the exhaust main of yarn, directed to the filament-forming cup, in the case of yarn breakage. Moreover, the device of the present invention is simple in operation, and the position of the outlet of the gating arrangement at the juncture of the housing with ,the cover enables one to easily service the device of the in- 'vention and to control its operation.

Other objects and advantages of the present invention will be more apparent from the following detailed description of an exemplary embodiment thereof with reference to the accompanying drawing, wherein:

FIG. 1 is the twisting device, according to the invention, shown in cross section;

FIG. 2 is a top view of same, partially broken away; and

FIG. 3 shows, in perspective, the gating arrangement in the device according to the invention.

The twisting device for pneumatic spinning in machines with separate processes of spinning. and winding has a rotary filament-forming cup 1 (*FIG. 1) positioned in a housing 2 with a cover 3. Provided in housing 2 is an air exhaust duct 4 (FIG. 2) connected with an air main 5.

Cover 3 (FIG. 1) accommodates a fiber inlet channel 6 serving to introduce the fiber into the filament-forming cup under the action of a vacuum produced in the latter, and a yarn outlet channel 8 for delivery of yarn produced in cup 1. Arranged above channel 8 is a pair of draft rollers 9 and a sensing unit 10 detecting the tension of the outgoing yarn.

Fiber inlet channel 6 is provided with at least one offtake channel 11 for removing fibers, directed into cup 1, in the event of yarn breakage, the number of the olftake channels corresponding to that of the fiber inlet channels.

Offtake channel 11 adjoins air exhaust duct 4 (FIG. 2). Housing 2, at the juncture of the otftake channel 11 with air exhaust duct 4, is provided with a chamber 12 housing a gating arrangement which is pivotal in chamber 12 to alternately close channels 11 and 4. Chamber 12 is con nected with air main 5.

The gating arrangement is fashioned as a flap gate 13 rotated about an axis 14 (FIG. 3) by means of a rod 15 connected with an actuating mechanism, i.e. electromagnet 16, controlled by sensing unit 10, and a spring 17. Gate 13 (FIG. 2) closes either air exhaust duct 4 in the case of yarn breakage, or offtake channel 11 when the spinning process operates normally.

Filament-forming cup 1 (*FIG. 1) is provided with a port 18 for sucking off air from cup 1 and with a collecting surface 19 forming the cup walls, said surface serving to produce a strand of fiber, thus forming yarn.

The operation of the proposed twisting device is as follows.

At normal operation of the spinning process the fibers, under the action of vacuum produced in filament-forming cup 1, are delivered into said cup through channel 6. With the aid of a separator 20 fixed on cover 3 and lowered inside cup 1, the fiber is directed onto collecting surface 19 of rapidly rotating cup 1. Sucked onto the same surface 19 through yarn outlet channel 8 is a filament whose end serves as a basis for forming yarn in cup 1. The pair of draft rollers 9 pull out the filament followed by the produced yarn whose tension is controlled by sensing unit 10.

During this process, gate 13- (FIG. 2) closes ofitake channel 11 and the air is sucked from filament-forming cup 1 and channels 6 and '8 through duct 4 and chamber 12 to air main 5.

In the case of yarn breakage, sensing unit 10 sends a signal to electromaget 16 which pulls rod 15 (FIG. 3)

3 and turns flap gate 13 about axis 14, thereby closing air exhaust duct 4 (in FIG. 2 this position of gate 13 is shown in dotted lines). As a result, air together with fiber will be sucked from channel 6 via offtake channel 11 into chamber 12 and, further on, to air main 5.

The direction of air flow through yarn outlet channel 8 (FIG. 1) remains the same, since air comes to oiftake channel 11 both from the zone of drafter 7 and from filament-forming cup 1. Since the direction of air flow in yarn outlet channel 8 does not vary, the resetting of the device is also possible. When inserting a filament into filament-forming cup 1 and drawing it off by the pair of drafting rollers 9, there is produced tension in the filament, and sensing unit 10 sends a signal which deactivates electromagnet 16 (FIG. 3). Spring 17 pivots rod to its initial position and turns gate 13 about axis 14 so that the gate covers offtake channel 11 (FIG. 2) and opens air exhaust duct 4. The fiber starts entering the filament-forming cup, and the spinning process is resumed.

Since chamber 12 is closed in its upper part by cover 3, the gating arrangement positioned in the chamber has an outlet at the juncture of housing 2 with cover 3 and is always accessible for adjustment and cleaning.

We claim:

1. A twisting device for pneumatic spinning, said device comprising: a housing; a rotary filament-forming cup mounted in said housing; said housing having an air exhaust duct; a cover for said housing; said cover having at least one channel for the inlet of fiber into said filament-forming cup; said cover having an outlet for yarn from said filament-forming cup; an offtake channel in communication with said fiber inlet channel for removing fiber from said fiber inlet channel in the event of yarn breakage; an exhaust air main, said ofitake channel and an exhaust duct forming a juncture with one another coupled to said exhaust main; a gating arrangement positioned at the juncture of said olftake channel with the air exhaust duct for alternate closure of said ofitake channel and duct; and a sensing unit serving to detect yarn tension, said unit being positioned above said yarn outlet and coupled to said gating arrangement for operation thereof.

2. A twisting device according to claim 1, wherein the gating arrangement comprises a pivotal flap connected with an actuating mechanism operated by the sensing unit, said gate serving to close the air exhaust duct in the case of yarn breakage or the ofitake channel in the normal operation of the spinning process.

3. A twisting device according to claim 2, wherein said actuating mechanism comprises an electromagnet coupled to said flap and operated by said sensing unit to pivotably move the flap.

4. A twisting device according to claim 1, wherein the number of oiftake channels corresponds to the number of fiber inlet channels.

5. A twisting device according to claim 1, wherein the gating arrangement is disposed at the juncture of the housing with the cover.

References Cited UNITED STATES PATENTS JOHN PETRAKES, Primary Examiner US. Cl. X.R. 57-80 

